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  The chemistry of stars in the bar of the Milky Way

Wegg, C., Rojas-Arriagada, A., Schultheis, M., & Gerhard, O. (2019). The chemistry of stars in the bar of the Milky Way. Astronomy and Astrophysics, 632: A121. doi:10.1051/0004-6361/201936779.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-8EF9-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-8EFA-2
Genre: Journal Article

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Wegg, C.1, Author              
Rojas-Arriagada, A., Author
Schultheis, M., Author
Gerhard, O.1, Author              
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1Optical and Interpretative Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159895              

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 Abstract: We use a sample of 938 red clump giant stars located in the direction of the Galactic long bar to study the chemistry of Milky Way bar stars. Kinematically separating stars on bar orbits from stars with inner disc orbits, we find that stars on bar-like orbits are more metal rich with a mean iron abundance of ⟨[Fe/H]⟩ = +0.30 compared to ⟨[Fe/H]⟩ = +0.03 for the inner disc. Spatially selecting bar stars is complicated by a strong vertical metallicity gradient of −1.1 dex kpc−1, but we find the metallicity distribution varies in a manner consistent with our orbital selection. Our results have two possible interpretations. The first is that the most metal rich stars in the inner Galaxy pre-existed the bar, but were kinematically cold at the time of bar formation and therefore more easily captured onto bar orbits when the bar formed. The second is that the most metal rich stars formed after the bar, either directly onto the bar following orbits or were captured by the bar after their formation.

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 Dates: 2019-11-15
 Publication Status: Published online
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 Identifiers: DOI: 10.1051/0004-6361/201936779
Other: LOCALID: 3189549
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Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
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Publ. Info: France : EDP Sciences S A
Pages: - Volume / Issue: 632 Sequence Number: A121 Start / End Page: - Identifier: ISSN: 1432-0746
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1